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//Chapter 5:Dc Motor Drives
//Example 3
clc;
//Variable Initialization
//Motor ratings
V1=220 //rated voltage in V
Ia1=200 //rated current in A
Ra=0.06 //armature resistance in ohms
Rb=0.04 //internal resistance of the variable source in ohms
N1=800 //speed in rpm
N2=600 //speed when motor is operatingin regenerative braking in rpm
//Solution
Ia2=0.8*Ia1 //motor is opereting in regenerative braking at 80% of Ia1
E1=V1-Ia1*Ra //back emf at rated operation
E2=(N2/N1)*E1 //back emf at the given speed N2
V2=E2-Ia2*(Ra+Rb) //internal voltage of thevariable source
//Results
mprintf("\n Internal voltage of the variable source:%.1f V",V2)
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